JEE Main 2014 Physics question
An n-p-n transistor has three leads A, B and C. Connecting B and C by moist fingers, A to the positive lead of an ammeter, and C to the negative lead of the ammeter, one finds large deflection. Then, A, B and C refer respectively to :
Answer: (2)
Solution
A large current flows from A to C, so the junction between them must be forward biased. In an n-p-n transistor this happens when the base (p-type) is positive with respect to the emitter (n-type), so
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